On Thu, May 27, 2021 at 05:43:39PM +0800, Chunfeng Yun wrote:
> On Thu, 2021-05-27 at 09:28 +0200, Greg Kroah-Hartman wrote:
> > On Tue, May 25, 2021 at 04:59:24PM +0800, Chunfeng Yun wrote:
> > > Add helper to get "role-switch-default-mode", and convert it
> > > to the corresponding enum usb_dr_mode
> > >
> > > Signed-off-by: Chunfeng Yun <chunfeng.yun@xxxxxxxxxxxx>
> > > ---
> > > drivers/usb/common/common.c | 20 ++++++++++++++++++++
> > > include/linux/usb/otg.h | 1 +
> > > 2 files changed, 21 insertions(+)
> > >
> > > diff --git a/drivers/usb/common/common.c b/drivers/usb/common/common.c
> > > index fff318597337..78a625a4e526 100644
> > > --- a/drivers/usb/common/common.c
> > > +++ b/drivers/usb/common/common.c
> > > @@ -207,6 +207,26 @@ enum usb_dr_mode usb_get_dr_mode(struct device *dev)
> > > }
> > > EXPORT_SYMBOL_GPL(usb_get_dr_mode);
> > >
> > > +/**
> > > + * usb_get_role_switch_default_mode - Get default mode for given device
> > > + * @dev: Pointer to the given device
> > > + *
> > > + * The function gets string from property 'role-switch-default-mode',
> > > + * and returns the corresponding enum usb_dr_mode.
> > > + */
> > > +enum usb_dr_mode usb_get_role_switch_default_mode(struct device *dev)
> > > +{
> > > + const char *str;
> > > + int ret;
> > > +
> > > + ret = device_property_read_string(dev, "role-switch-default-mode", &str);
> > > + if (ret < 0)
> > > + return USB_DR_MODE_UNKNOWN;
> > > +
> > > + return usb_get_dr_mode_from_string(str);
> > > +}
> > > +EXPORT_SYMBOL_GPL(usb_get_role_switch_default_mode);
> > > +
> > > /**
> > > * usb_decode_interval - Decode bInterval into the time expressed in 1us unit
> > > * @epd: The descriptor of the endpoint
> > > diff --git a/include/linux/usb/otg.h b/include/linux/usb/otg.h
> > > index a86ee6aad51b..bde313c97fb6 100644
> > > --- a/include/linux/usb/otg.h
> > > +++ b/include/linux/usb/otg.h
> > > @@ -121,5 +121,6 @@ enum usb_dr_mode {
> > > };
> > >
> > > extern enum usb_dr_mode usb_get_dr_mode(struct device *dev);
> > > +extern enum usb_dr_mode usb_get_role_switch_default_mode(struct device *dev);
> >
> > What other code outside of the dwc3 driver will ever need to call this?
> I prepare a series of pathes for mtu3, and will support
> "role-switch-default-mode" property
Ok, how about we wait until at least 2 drivers need it before accepting
this change.
thanks,
greg k-h
